Can you drive to Devenish Island, and where do boat trips depart?
No. Devenish Island’s monastic remains in Lower Lough Erne are accessible only by water; you cannot park beside the round tower or drive across a bridge.
The official attraction listing confirms the island’s water-only access. One excursion operator, Erne Tours, advertises trips departing from Round O Jetty in Enniskillen, with seasonal departure patterns. A free heritage-site entry listing does not mean transport by boat is free: the boat operator has separate charges and sailing times. Weather and water conditions can disrupt crossings.
Practical advice: Arrange the crossing first, then choose legal parking near your actual departure jetty. Check the return sailing and leave time for boarding. The island has exposed ruins and official warnings about loose masonry, so keep clear of fragile walls.